Vane pump



May 19, 1925. 1,538,075

` S. G. WINGQUIST vANE PUMP Filed Feb. 27. 1525 QUIsT, doctor, a subjectof the King of.

borg, Sweden, have invented certain new and useful Improvements in VanePumps, of.

Patented `May 19, 1925.

UNITED STATES SVEN GUSTAF WIN'GrQUIST, OF GOTTENBORG, SWEDEN.

vANE PUMP.

Application led February 27, 1923. Seria1No.l621,578.

To all whom z't may concer/n.' v j Be it known that I, SVEN GUsTAF WING-Sweden, residing at Vasagatan 46, Gottenwhich the following is aspecification.

This invention relates to vane pumps, which comprisel a stator and arotor and working vanes, and has for its object to provide a meanswhereby the position of the pumping surfaces may be controlled toeffect, as desired, either idle running or positive pumping action.

According to the invention the extent of the radial movement of theworking vanes is regulated by suitable cam surfaces, the position ofwhich with relation to the working vanes may be automatically. adjustedby means of one or more centrifugal governor weights acting against acounterbalancing spring or springs.

In the accompanying drawing, wherein one embodiment of a vane pumpaccording to this invention is shown; Fig. 1 isfan axial section of thevane pump. Fig. 2 is an end view thereof having thel side cover removed.Fig. 3 is a cross-section along the line 3-3 viewed from the right inFig. 1.

Figs. 4, 5, and 6 show in enlarged scale various modifications of thecam surfaces 13. lThe vane pump sho-wn in the drawing is of the doubleacting type and comprises in known manner a stator 1, provided withworking surfaces 2, 3 and abutments 4, 5. Within such stator isrotatably mounted a rotor 6, provided with radially movable vanes 7 saidvanes carrying guide rollers 8,

i which co-operate lwith internal cam surface vanes will be under commoncontrol.

10, provided in the stator cover 9, to positively limit the outwardmovement of the vanes. The vanes 7 are acted on by springs 11 tending tomaintain the rollers 8 in contact with the'aforementioned cam surface 10and by this means thevanes at the proper radius to vcontact with theworking' surfaces 2 and 3. The vanes 7 are according to the inventioneach provided near their inner extremities with an integrally formedguide lug 12, co-operating with eccentrically ,disposed internal camelements 13, preferably combined in a common cam ring 14 rotatable withrelation to the rotor 6, whereby all the The cam ringY 14'supported byarms 19 extending radially from a central hub portion 20 Aof specialform, the object of which will be presently made clear. Pivotallyconnected to the rotor 6 are bell cranks 21, one arm 15 of each beingformed as a governor weight which is acted upon in the direction of therotor center by a tension spring 16 `fastened dividual vane controllingcam surfaces 13 will be rotated in a clockwise direction, which isobviously the case as shown in Fig. 3. The cam surfaces 13 have such aform as to permit upon a rotation of ring 14, a progressivelyV greateror lesser radial movement of the workin vanes 7, depending upon thedirection o rotation of the ring. The cam ring inthe positionillustrated permits the maximum outward movement of the vanes 7 in whichposition they come in contact with the working surfaces 2, 3, in thestator 1. In Fig. 3, the governor weights 15 are shown as having at acertain speed, through the/action of centrifugal force, been movedoutwardly against the action of the.

spring 16, causingar1ns17 to rotate the ring 14 carrying internal camsurfaces 13 to the position described in which contact may exist betweenthe working vanes 7 and the working surfaces 2, 3. In thisposition thepump is functioning with full eiiciency. If now we suppose the speed ofrotationof the rotor 6 to be decreased, the centrifugalforce of theweights 15 will also decrease and said force will,`- at a certainreduced speed of rotation, be overcome by the tension of the springs 16.The resulting movement of the bell cranks 21, causes the cam ring 14 tobe rotated to a position in which the radial movement of the vanes?,.will be limited, so that contact with the working surfaces cannot takeplace and, consequently, the pump will run' idle or at greatly reducedeficiency depending upon the clearance between the vanes and workingsurfaces. By

the described control of the vanes 7 by means Y of the cam ring 14, theradial movements of the vanes take place smoothly and without any riskof shock against the working surfaces 2, 3.

Obviousl the invention is applicable to pumping evices in which it isdesired to effect idle running at more than one speed range, with apositive pumping action between such idle running4 ranges, or devices inwhich it is desired to effect idle running above a certain speed. In thelatter. case the cam surfaces 13 should be designed in such manner as topermit, in the position which they occupy up to a certain speed, contactbetween'the working vanes and the working surfaces, but in theirposition at a higher speed, through their automatic movement, to preventsuch contact. l In the former case two ranges of idle running, for eX-ample, may be provided by designing cam surfaces 18 with two vanelifting humps i with a non-lifting dwell between, which portions may besuccessively brought into action as the cams are caused to move in onedirection or the other by a change in the speed of rotation of the pumpwith the consequent automatic shifting of the governor weights as hasbeen fully explained.

Throughout the foregoing specification, and in the .following claims,the terms rotor and stator are used merelyl in the relative sense. Inthe carrying out of the invention it is obviously immaterial las towhich of the two co-acting elements, between which the pumping actionoccurs, is stationary or whether eithei' be absolutely stationary, theonly requirement being that as between the'two there `is a relativemotion, or, as has been stated, one withl respect to the other'isrelatively stationary.

It is to be understood that the invention is not limited to thepreferred embodiment which is described in the foregoing, but issusceptible of various adaptations and modifications without departingfrom the spirit of the invention andl within the scope of the followingclaims. 'f

What I claim as new and desire to secure by Letters Patent of the UnitedStates of America is v 1. In a vane pump comprising a stator and a rotorand .workin vanes movable radiallyv 00 ,radially or substantiallyradially in one of said parts, the other part lbeing provided with oneor more working surfaces co-operating with said radially movable vanes,and means comprising springs, movable weights and cam members adjustablyconnected to Asaid rotor for positively limiting the radial movement ofsaid vanes in the direction Vtowards lthe said working surfaces, theposition of said cam members with relation to the working vanes beingautomatically conescape means to permit direct communication between thepresure and suction sides of the pump by preventing fluid tightengagement of the normally coacting working parts of said rotor andstator.

4. A vane pump comprising a stator, a

` rotor, and pumping vanes', said vanes pei'- lforming generally radialmovements in the course of the normal pumping cycle, and escape meanscomprising auxiliary vane control means to prevent, atY certain speeds,normal operating contact between the vanes and thev working surfaces ofthe pump.

5. A vane pump comprising a stator, `a

rotor, and pumping vanes, said vanes performing generally radialmovements in the course Vof the normal pumping cycle, and automaticescapemeans comprising `a cam ring, the position of which is controlledby centrifugal force to permit, at certain speeds,

'direct communication between the pressure and suction sides of thepumpby `preventing fluid-tight engagement of the normally coactingworking parts of said rotor and stator.

6. `A vane pump. comprising a stator, a

rotor, and pumping vanes, said vanes performing generally radialmovements in the course of the normal pumping cycle, and automaticescape means comprising a cam ring the position of which is controlledby the spring ballasted centrifugal governor to permit, at certainspeeds, direct communication between the pressure and suction sides ofthe pump by preventing fluid-tight engagement of the normally coactingworking parts of said rotor and stator. In testimony whereof I afiix mysignature in presence of two witnesses.

a SVEN GUSTAF WINGQUIST.

Witnesses:

Imm Lorouis'r,

O. F. LUNDBERG.

ics

Ueruncate of Correction.

It is hereby certified that in Letters Patent No. 1,538,075, Granted May19, 1925, upon .the applic-ation of Sven Gustaf VVingquist, of Grottenorg, Sweden, for an improvement in Vane Pumps, errors appear in theprintedl speoiction requiring correction as follows: Page 2, lines 77,86, 94, and 105, claims 3, 4, 5, and 6, respeo tively, after the Wordcycle insert the Words independently of the working sw'- facesco-aotz'ng with the Mmes, and line 7 8, cla-im 3, strike out the Wordescape same line and claim, after the Word means insert the Wordadapted; and that the' said Letters Patent should be read with thesecorrections therein that the same may conform to the record of the casein the Patent ice. Signed and sealed this 18th day of-August, A. D.1925.

[SEAL] KARL FENNING,

v. Actna Commissione of Eatents.

